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Asset Sale and Loan Restructuring - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 10, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Fair value of asset given up amount | $ 19,125,131 |  |  | $ 19,125,131
Repayment of borrowed money |  | $ 408,768 | $ 158,798 | 1,808,344
Net carrying book value of assets sold |  |  |  | 13,500,000
Fair value of assets sold |  |  |  | 19,100,000
Carrying value of assets given up |  |  |  | 13,513,223
Gain on debt extinguishment |  |  |  | 5,611,907
Gain on restructure of debt |  |  |  | 891,345
Undiscounted future cash flows |  |  |  | 3,449,632
Inventories [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net carrying book value of assets sold |  |  |  | 5,100,000
Building and Land [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net carrying book value of assets sold |  |  |  | 2,100,000
Accounts Receivable [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Net carrying book value of assets sold |  |  |  | $ 6,300,000
Magellan Offshore Services Ltd [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Asset acquisition agreement, percentage of net value of traded asset | 21.25% |  |  |
Asset acquisition agreement, period for transferring amount | 5 years |  |  |
Monaco [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Repayment of borrowed money | $ 11,700,000 |  |  |

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